In today's flow meter market, there are a wide variety of flow meters and different performances. This makes it more difficult for the purchaser to select the flow meter. Before the selection, we must understand the main types of flow meter and the main performance of each type.

At present, the most commonly used flowmeter classification methods include differential pressure flowmeters, positive displacement flowmeters, differential pressure flowmeters, floater flowmeters, turbine flowmeters, electromagnetic flowmeters, and vortex flowmeters in fluid oscillation flowmeters. Mass flow meters, etc. briefly describe the principle and characteristics of various flow meters. 2. Differential pressure flowmeter: C# p# {) l+ u7 `( K"
Differential pressure flowmeters are differential pressure flowmeters that are installed on a differential pressure generated by a flow detection element in an industrial pipeline, which measures the known fluid condition and the geometry of the test piece and the pipe. * h; R L8 n: a6 W; T
Differential pressure flowmeter consists of a test piece and a secondary instrument (differential pressure transducer or transmitter and flow display instrument). The differential pressure flowmeters are classified in the form of test pieces, including orifice plate flowmeters, venturi flowmeters, and uniform velocity tube flowmeters. The secondary instrument is a variety of mechanical, electronic, electromechanical differential pressure flow meter, differential pressure transmitter and flow display instrument. Differential pressure flow meter is the most widely used medium and large flow meter in the large family of flow meters. At present, it has been serialized, generalized and standardized at home and abroad. Differential pressure flow meter can measure flow parameters separately, and can also measure other parameters ( Pressure, level, density, etc. Differential pressure flow meter detection parts according to its principle can be divided into: throttling device, hydraulic resistance, dynamic pressure head type, dynamic pressure head gain and jet type, and centrifugal type several major categories.
There are two types of test items, standardized or non-standard. Standard type detection elements are designed, manufactured, installed, and used in standard files. Flow measurements and estimated measurement errors can be determined without real-world calibration. Non-standard type detection elements are generally not included in the international standards for detection components. Differential pressure flowmeters are also the most widely used type of flow meter and occupy the first place in the use of various flow meters. 5 w) m6 p- B9 l5 N

The main advantages are: (1) The most widely used perforated plate flowmeter has a solid structure, stable and reliable performance, and long service life; (2) a wide range of applications, so far no one flowmeter can be compared with it; (3) test pieces and Transmitters and display meters are produced by different manufacturers, facilitating economies of scale production.
The main disadvantages are: (1) the measurement accuracy is generally low: (2) narrow range, generally only 3:1 ~ 4:1; (3) high requirements for on-site installation conditions; (4) large pressure loss (finger plate, Nozzles, etc.) * }1 m, E6 y! J. M5 I0 k$ ^- ~8 \/ u
3. Positive displacement flowmeter 1 O0 ], H) X4 Y$ Q0 X6 u1 f$ J
Volumetric flowmeters, also known as fixed displacement flowmeters, referred to as PD flowmeters, are among the most accurate in flow meters. It uses a mechanical measuring element to continuously divide the fluid into a single known volume fraction, measuring the total volume of fluid according to the number of times that the measurement chamber fills and discharges the volume fraction of fluid sequentially and repeatedly.
Volumetric flowmeters are classified according to their measuring components: elliptical gear flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disk flowmeters, wet gas meters, diaphragm gas meters, and liquid-sealed tumbler flowmeters. 5 r6 P8 @9 |6 D9 o" k9 n%
The main advantages are: (1) high measurement accuracy; (2) installation pipeline conditions have no influence on measurement accuracy; (3) can be used for the measurement of high-viscosity liquids; (4) wide range; (5) direct-reading instruments do not require external energy Accumulation can be directly obtained, the total amount is clear and easy to operate. 7 W4 v! R; {5 g' b3 m/ i; n

Main disadvantages: (1) The results are complex and bulky; (2) The types of medium to be measured, the caliber, and the working conditions of the medium are limited; (3) It is not suitable for high and low temperature applications; (4) Most of the instruments are only suitable for Clean single-phase fluid; (5) Generate noise and vibration. Float flow meter
A float flowmeter, also known as a rotameter, is a type of variable area flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of a float of circular cross-section is subjected to hydrodynamic force, so that the float It can rise and fall freely in the cone.
Float flowmeter is a type of flowmeter that is widely used after differential pressure flowmeter and is suitable for monitoring micro flow. / P t2Q8 b+ a

The main advantages: (1) simple structure, easy to use; (2) suitable for small diameter and low flow rate; (3) lower pressure loss. Disadvantages: low pressure resistance, glass tube fragile.

5. Turbine flow meter

Turbine flowmeter is a main type of velocity flowmeter. Its structure is composed of a multi-blade rotor (turbine) sensing the average flow velocity of the fluid to measure the flow or total flowmeter. Its structure consists of two parts: sensor and display instrument. There are two kinds of split type and integrated type.
Turbine flow meters and positive displacement flow meters, and Kooly mass flow meters are collectively referred to as the three types of repeatability and the best accuracy in flow meters. At present, it has grown toward more varieties and more series.
The main advantages: (1) high precision, is the most accurate flow meter in all flow meter instruments; (2) good repeatability; (3) no zero drift, good anti-interference; (4) wide measurement range; 5) Compact structure.
The main disadvantages: (1) can not maintain the calibration characteristics for a long time; (2) fluid properties have a greater impact on the flow characteristics. & j3 Z3 @& ]# C+ 6. Swirl Flowmeter
The structure of the swirler flowmeter is to place a non-streamlined vortex generator in the fluid. When the fluid is alternately separated on both sides of the vortex generator, two series of staggered vortex vortex meters are released. ' [: w/ K3 t6 h3 v+ Y: ?7 a: E

Vortex flowmeters are generally classified according to the frequency of detection: stress type, strain type, capacitance type, thermal type, photoelectric type and ultrasonic type, vibration type, etc. ) U: O2 ^; q9 ?- i$ ~

Vortex flowmeter is a new flow meter at home and abroad.
The main advantages are: (1) simple and firm structure; (2) suitable for occasional flow of multiple fluid types; (3) high measurement accuracy; (4) wide measurement range and low pressure loss.
The main disadvantages are: (1) not suitable for low Reynolds number fluid measurement; (2) long straight pipe section; (3) lower meter factor than turbine meter. 7. Magnetic flowmeter
Electromagnetic flowmeters consist of sensors, transducers, and displays. Electromagnetic flowmeters are generally based on Faraday's law of electromagnetic induction to measure the flow of a conductive fluid. E5 g- ?1 A2 B0 R; [6 l8 c7 o

Electromagnetic flowmeters have unique advantages over other flowmeters and are particularly suitable for measurements of dirty fluids and corrosive fluids. Electromagnetic flowmeters have made significant technological breakthroughs in the 70-80s due to electromagnetic flow, making it a widely used flow monitoring instrument in modern industrial fields.
The main advantages: (1) Because the measurement channel is smooth and straight, it is not obstructed. It is especially suitable for solid-liquid two-phase fluids, such as pulp, sewage, mud, etc.; (2) No pressure loss, good energy-saving effect; (3) Not affected by changes in the humidity, density, viscosity, pressure, and conductivity of the fluid; (4) Large flow range and wide bore diameter; (5) Applicable to the measurement of corrosive fluids. Main disadvantages: (1) Not applicable to the measurement of petroleum product fluids released; (2) Not applicable to gases, steam, and liquids containing large bubbles; (3) Not suitable for high temperature applications. 8. Ultrasonic flowmeter

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